title: High-level production of recombinant human parathyroid hormone 1-34.
abstract: Expression of the synthetic human parathyroid hormone 1-34 [hPTH(1-34)] gene by a gene fusion strategy was demonstrated. hPTH(1-34) was produced at the C terminus of the partner peptides involving amino acids 1 to 97, 1 to 117, or 1 to 139 of a modified Escherichia coli beta-galactosidase by linker peptides containing oligohistidine of different lengths. The fusion proteins in the inclusion bodies were rendered soluble with urea and subjected to site-specific cleavage with the secretory type yeast Kex2 protease. Optimal expression and enzymatic processing were achieved in the fusion protein beta G-117S4HPT, constructed from amino acids 1 to 117 of beta-galactosidase and the linker of HHHHPGGSVKKR. The fusion protein accumulated more than 20% of the E. coli total protein. The hPTH(1-34) was purified up to 99.5% with a good yield of 0.5 g/liter of culture. The purified product was identified as intact hPTH(1-34) by amino acid analysis and N-terminal sequencing.
authors.affiliation: Suntory Institute for Medicinal Research and Development, Gunma, Japan. 100545@116.mail.suntory.co.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Yabuta
authors.forename: K
authors.initials: K
authors.lastname: Ohsuye
mesh_terms: D006801:Humans; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis*; D019379:Teriparatide / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D011993:Recombinant Fusion Proteins; D019379:Teriparatide